Author: buildbot
Date: Tue Dec 13 18:30:59 2011
New Revision: 800214
Log:
Staging update by buildbot
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img1.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img2.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img3.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img4.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img5.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Administration.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Analytics.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Contents.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/High_Speed_Ingest.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Security.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Shell_Commands.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Table_Configuration.html
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/img1.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/img4.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/img5.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/img6.png
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/img7.png
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img1.png
==============================================================================
Binary files - no diff available.
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img2.png
==============================================================================
Binary files - no diff available.
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img3.png
==============================================================================
Binary files - no diff available.
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img4.png
==============================================================================
Binary files - no diff available.
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.3-incubating/img5.png
==============================================================================
Binary files - no diff available.
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Administration.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Administration.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Administration.html
Tue Dec 13 18:30:59 2011
@@ -127,7 +127,7 @@
<h2 id="a_idconfigurationa_configuration"><a id=Configuration></a>
Configuration</h2>
<p>Accumulo is configured by editing several Shell and XML files found in
$ACCUMULO_HOME/conf. The structure closely resembles Hadoop's configuration
files. </p>
<h3 id="a_idedit_confaccumulo-envsha_edit_confaccumulo-envsh"><a
id=Edit_conf/accumulo-env.sh></a> Edit conf/accumulo-env.sh</h3>
-<p>Accumulo needs to know where to find the software it depends on. Edit
accumuloenv. sh and specify the following: </p>
+<p>Accumulo needs to know where to find the software it depends on. Edit
accumulo-env.sh and specify the following: </p>
<ol>
<li>Enter the location of the installation directory of Accumulo for
$ACCUMULO_HOME</li>
<li>Enter your system's Java home for $JAVA_HOME</li>
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Analytics.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Analytics.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Analytics.html
Tue Dec 13 18:30:59 2011
@@ -97,7 +97,7 @@
<p><a id=CHILD_LINKS></a><strong>Subsections</strong></p>
<ul>
<li><a href="Analytics.html#MapReduce">MapReduce</a></li>
-<li><a href="Analytics.html#Aggregating_Iterators">Aggregating
Iterators</a></li>
+<li><a href="Analytics.html#Combiners">Combiners</a></li>
<li><a href="Analytics.html#Statistical_Modeling">Statistical Modeling</a></li>
</ul>
<hr />
@@ -192,12 +192,12 @@
<p>An example of using MapReduce with Accumulo can be found at <br />
accumulo/docs/examples/README.mapred </p>
-<h2 id="a_idaggregating_iteratorsa_aggregating_iterators"><a
id=Aggregating_Iterators></a> Aggregating Iterators</h2>
-<p>Many applications can benefit from the ability to aggregate values across
common keys. This can be done via aggregating iterators and is similar to the
Reduce step in MapReduce. This provides the ability to define online,
incrementally updated analytics without the overhead or latency associated with
batch-oriented MapReduce jobs. </p>
-<p>All that is needed to aggregate values of a table is to identify the fields
over which values will be grouped, insert mutations with those fields as the
key, and configure the table with an aggregating iterator that supports the
summarization operation desired. </p>
-<p>The only restriction on an aggregating iterator is that the aggregator
developer should not assume that all values for a given key have been seen,
since new mutations can be inserted at anytime. This precludes using the total
number of values in the aggregation such as when calculating an average, for
example. </p>
+<h2 id="a_idcombinersa_combiners"><a id=Combiners></a> Combiners</h2>
+<p>Many applications can benefit from the ability to aggregate values across
common keys. This can be done via Combiner iterators and is similar to the
Reduce step in MapReduce. This provides the ability to define online,
incrementally updated analytics without the overhead or latency associated with
batch-oriented MapReduce jobs. </p>
+<p>All that is needed to aggregate values of a table is to identify the fields
over which values will be grouped, insert mutations with those fields as the
key, and configure the table with a combining iterator that supports the
summarizing operation desired. </p>
+<p>The only restriction on an combining iterator is that the combiner
developer should not assume that all values for a given key have been seen,
since new mutations can be inserted at anytime. This precludes using the total
number of values in the aggregation such as when calculating an average, for
example. </p>
<h3 id="a_idfeature_vectorsa_feature_vectors"><a id=Feature_Vectors></a>
Feature Vectors</h3>
-<p>An interesting use of aggregating iterators within a Accumulo table is to
store feature vectors for use in machine learning algorithms. For example, many
algorithms such as k-means clustering, support vector machines, anomaly
detection, etc. use the concept of a feature vector and the calculation of
distance metrics to learn a particular model. The columns in a Accumulo table
can be used to efficiently store sparse features and their weights to be
incrementally updated via the use of an aggregating iterator. </p>
+<p>An interesting use of combining iterators within a Accumulo table is to
store feature vectors for use in machine learning algorithms. For example, many
algorithms such as k-means clustering, support vector machines, anomaly
detection, etc. use the concept of a feature vector and the calculation of
distance metrics to learn a particular model. The columns in a Accumulo table
can be used to efficiently store sparse features and their weights to be
incrementally updated via the use of an combining iterator. </p>
<h2 id="a_idstatistical_modelinga_statistical_modeling"><a
id=Statistical_Modeling></a> Statistical Modeling</h2>
<p>Statistical models that need to be updated by many machines in parallel
could be similarly stored within a Accumulo table. For example, a MapReduce job
that is iteratively updating a global statistical model could have each map or
reduce worker reference the parts of the model to be read and updated through
an embedded Accumulo client. </p>
<p>Using Accumulo this way enables efficient and fast lookups and updates of
small pieces of information in a random access pattern, which is complementary
to MapReduce's sequential access model. </p>
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Contents.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Contents.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Contents.html
Tue Dec 13 18:30:59 2011
@@ -168,7 +168,7 @@
<li><a
href="Table_Configuration.html#Setting_Iterators_Programmatically">Setting
Iterators Programmatically</a></li>
<li><a
href="Table_Configuration.html#Versioning_Iterators_and_Timestamps">Versioning
Iterators and Timestamps</a></li>
<li><a href="Table_Configuration.html#Filters">Filters</a></li>
-<li><a href="Table_Configuration.html#Aggregating_Iterators">Aggregating
Iterators</a></li>
+<li><a href="Table_Configuration.html#Combiners">Combiners</a></li>
</ul>
</li>
<li>
@@ -213,7 +213,7 @@
</ul>
</li>
<li>
-<p><a href="Analytics.html#Aggregating_Iterators">Aggregating Iterators</a></p>
+<p><a href="Analytics.html#Combiners">Combiners</a></p>
<ul>
<li><a href="Analytics.html#Feature_Vectors">Feature Vectors</a></li>
</ul>
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/High_Speed_Ingest.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/High_Speed_Ingest.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/High_Speed_Ingest.html
Tue Dec 13 18:30:59 2011
@@ -140,7 +140,7 @@
accumulo/docs/examples/README.bulkIngest </p>
<h2 id="a_idlogical_time_for_bulk_ingesta_logical_time_for_bulk_ingest"><a
id=Logical_Time_for_Bulk_Ingest></a> Logical Time for Bulk Ingest</h2>
<p>Logical time is important for bulk imported data, for which the client code
may be choosing a timestamp. At bulk import time, the user can choose to enable
logical time for the set of files being imported. When its enabled, Accumulo
uses a specialized system iterator to lazily set times in a bulk imported file.
This mechanism guarantees that times set by unsynchronized multi-node
applications (such as those running on MapReduce) will maintain some semblance
of causal ordering. This mitigates the problem of the time being wrong on the
system that created the file for bulk import. These times are not set when the
file is imported, but whenever it is read by scans or compactions. At import, a
time is obtained and always used by the specialized system iterator to set that
time. </p>
-<p>The timestamp asigned by accumulo will be the same for every key in the
file. This could cause problems if the file contains multiple keys that are
identical except for the timestamp. In this case, the sort order of the keys
will be undefined. This could occur if an insert and an update were in the same
bulk import file. </p>
+<p>The timestamp assigned by accumulo will be the same for every key in the
file. This could cause problems if the file contains multiple keys that are
identical except for the timestamp. In this case, the sort order of the keys
will be undefined. This could occur if an insert and an update were in the same
bulk import file. </p>
<h2 id="a_idmapreduce_ingesta_mapreduce_ingest"><a id=MapReduce_Ingest></a>
MapReduce Ingest</h2>
<p>It is possible to efficiently write many mutations to Accumulo in parallel
via a MapReduce job. In this scenario the MapReduce is written to process data
that lives in HDFS and write mutations to Accumulo using the
AccumuloOutputFormat. See the MapReduce section under Analytics for details.
</p>
<p>An example of using MapReduce can be found under <br />
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Security.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Security.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Security.html
Tue Dec 13 18:30:59 2011
@@ -164,9 +164,9 @@
</pre></div>
-<p>Any user with the alter table permission can add or remove this constraint.
This constraint is not applied to bulk imported data, if this a concern then
disable the bulk import pesmission. </p>
+<p>Any user with the alter table permission can add or remove this constraint.
This constraint is not applied to bulk imported data, if this a concern then
disable the bulk import permission. </p>
<h2 id="a_idsecure_authorizations_handlinga_secure_authorizations_handling"><a
id=Secure_Authorizations_Handling></a> Secure Authorizations Handling</h2>
-<p>For applications serving many users, it is not expected that a accumulo
user will be created for each application user. In this case a accumulo user
with all authorizations needed by any of the applications users must be
created. To service queries, the application should create a scanner with the
application users authorizations. These authorizations could be obtined from a
trusted 3rd party. </p>
+<p>For applications serving many users, it is not expected that a accumulo
user will be created for each application user. In this case a accumulo user
with all authorizations needed by any of the applications users must be
created. To service queries, the application should create a scanner with the
application users authorizations. These authorizations could be obtained from a
trusted 3rd party. </p>
<p>Often production systems will integrate with Public-Key Infrastructure
(PKI) and designate client code within the query layer to negotiate with PKI
servers in order to authenticate users and retrieve their authorization tokens
(credentials). This requires users to specify only the information necessary to
authenticate themselves to the system. Once user identity is established, their
credentials can be accessed by the client code and passed to Accumulo outside
of the reach of the user. </p>
<h2 id="a_idquery_services_layera_query_services_layer"><a
id=Query_Services_Layer></a> Query Services Layer</h2>
<p>Since the primary method of interaction with Accumulo is through the Java
API, production environments often call for the implementation of a Query
layer. This can be done using web services in containers such as Apache Tomcat,
but is not a requirement. The Query Services Layer provides a mechanism for
providing a platform on which user facing applications can be built. This
allows the application designers to isolate potentially complex query logic,
and enables a convenient point at which to perform essential security
functions. </p>
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Shell_Commands.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Shell_Commands.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Shell_Commands.html
Tue Dec 13 18:30:59 2011
@@ -373,19 +373,23 @@
</p>
<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">egrep</span> <span class="err"><regex></span> <span
class="err"><regex></span> <span class="err">[-?]</span> <span
class="err">[-b</span> <span class="err"><start-row>]</span> <span
class="err">[-c</span>
<span
class="err"><<columnfamily>[:<columnqualifier>]>]</span>
<span class="err">[-e</span> <span class="err"><end-row>]</span> <span
class="err">[-f</span> <span class="err"><int>]</span>
- <span class="err">[-np]</span> <span class="err">[-s</span> <span
class="err"><comma-separated-authorizations>]</span> <span
class="err">[-st]</span> <span class="err">[-t</span> <span
class="err"><arg>]</span>
+ <span class="err">[-np]</span> <span class="err">[-nt</span> <span
class="err"><arg>]</span> <span class="err">[-s</span> <span
class="err"><comma-separated-authorizations>]</span> <span
class="err">[-st]</span> <span class="err">[-t</span>
+ <span class="err"><table>]</span>
<span class="err">description:</span> <span class="err">searches</span> <span
class="err">each</span> <span class="err">row,</span> <span
class="err">column</span> <span class="err">family,</span> <span
class="err">column</span> <span class="err">qualifier</span> <span
class="err">and</span> <span class="err">value,</span> <span
class="err">in</span>
- <span class="err">parallel,</span> <span class="err">on</span> <span
class="err">the</span> <span class="err">server</span> <span
class="err">side</span> <span class="err">(using</span> <span
class="err">a</span> <span class="err">java</span> <span
class="err">regular</span> <span class="err">expression)</span>
+ <span class="err">parallel,</span> <span class="err">on</span> <span
class="err">the</span> <span class="err">server</span> <span
class="err">side</span> <span class="err">(using</span> <span
class="err">a</span> <span class="err">java</span> <span
class="err">Matcher,</span> <span class="err">so</span> <span
class="err">put</span> <span class="err">.*</span>
+ <span class="err">before</span> <span class="err">and</span> <span
class="err">after</span> <span class="err">your</span> <span
class="err">term</span> <span class="err">if</span> <span
class="err">you're</span> <span class="err">not</span> <span
class="err">matching</span> <span class="err">the</span> <span
class="err">whole</span>
+ <span class="err">element)</span>
<span class="err">-?,-help</span> <span class="err">display</span> <span
class="err">this</span> <span class="err">help</span>
<span class="err">-b,-begin-row</span> <span
class="err"><start-row></span> <span class="err">begin</span> <span
class="err">row</span> <span class="err">(inclusive)</span>
<span class="err">-c,-columns</span> <span
class="err"><<columnfamily>[:<columnqualifier>]></span>
<span class="err">comma-separated</span> <span class="err">columns</span>
<span class="err">-e,-end-row</span> <span
class="err"><end-row></span> <span class="err">end</span> <span
class="err">row</span> <span class="err">(inclusive)</span>
<span class="err">-f,-show</span> <span class="err">few</span> <span
class="err"><int></span> <span class="err">Only</span> <span
class="err">shows</span> <span class="err">certain</span> <span
class="err">amount</span> <span class="err">of</span> <span
class="err">characters</span>
<span class="err">-np,-no-pagination</span> <span
class="err">disables</span> <span class="err">pagination</span> <span
class="err">of</span> <span class="err">output</span>
+ <span class="err">-nt,-num-threads</span> <span
class="err"><arg></span> <span class="err">num</span> <span
class="err">threads</span>
<span class="err">-s,-scan-authorizations</span> <span
class="err"><comma-separated-authorizations></span> <span
class="err">scan</span> <span class="err">authorizations</span>
<span class="err">(all</span> <span class="err">user</span> <span
class="err">auths</span> <span class="err">are</span> <span
class="err">used</span> <span class="err">if</span> <span
class="err">this</span> <span class="err">argument</span> <span
class="err">is</span> <span class="err">not</span> <span
class="err">specified)</span>
<span class="err">-st,-show-timestamps</span> <span
class="err">enables</span> <span class="err">displaying</span> <span
class="err">timestamps</span>
- <span class="err">-t,-num-threads</span> <span
class="err"><arg></span> <span class="err">num</span> <span
class="err">threads</span>
+ <span class="err">-t,-tableName</span> <span
class="err"><table></span> <span class="err">table</span> <span
class="err">to</span> <span class="err">grep</span> <span
class="err">through</span>
</pre></div>
@@ -477,7 +481,8 @@
</p>
<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">grep</span> <span class="err"><term></span> <span
class="err"><term></span> <span class="err">[-?]</span> <span
class="err">[-b</span> <span class="err"><start-row>]</span> <span
class="err">[-c</span>
<span
class="err"><<columnfamily>[:<columnqualifier>]>]</span>
<span class="err">[-e</span> <span class="err"><end-row>]</span> <span
class="err">[-f</span> <span class="err"><int>]</span>
- <span class="err">[-np]</span> <span class="err">[-s</span> <span
class="err"><comma-separated-authorizations>]</span> <span
class="err">[-st]</span> <span class="err">[-t</span> <span
class="err"><arg>]</span>
+ <span class="err">[-np]</span> <span class="err">[-nt</span> <span
class="err"><arg>]</span> <span class="err">[-s</span> <span
class="err"><comma-separated-authorizations>]</span> <span
class="err">[-st]</span> <span class="err">[-t</span>
+ <span class="err"><table>]</span>
<span class="err">description:</span> <span class="err">searches</span> <span
class="err">each</span> <span class="err">row,</span> <span
class="err">column</span> <span class="err">family,</span> <span
class="err">column</span> <span class="err">qualifier</span> <span
class="err">and</span> <span class="err">value</span> <span
class="err">in</span> <span class="err">a</span>
<span class="err">table</span> <span class="err">for</span> <span
class="err">a</span> <span class="err">substring</span> <span
class="err">(not</span> <span class="err">a</span> <span
class="err">regular</span> <span class="err">expression),</span> <span
class="err">in</span> <span class="err">parallel,</span> <span
class="err">on</span>
<span class="err">the</span> <span class="err">server</span> <span
class="err">side</span>
@@ -487,10 +492,11 @@
<span class="err">-e,-end-row</span> <span
class="err"><end-row></span> <span class="err">end</span> <span
class="err">row</span> <span class="err">(inclusive)</span>
<span class="err">-f,-show</span> <span class="err">few</span> <span
class="err"><int></span> <span class="err">Only</span> <span
class="err">shows</span> <span class="err">certain</span> <span
class="err">amount</span> <span class="err">of</span> <span
class="err">characters</span>
<span class="err">-np,-no-pagination</span> <span
class="err">disables</span> <span class="err">pagination</span> <span
class="err">of</span> <span class="err">output</span>
+ <span class="err">-nt,-num-threads</span> <span
class="err"><arg></span> <span class="err">num</span> <span
class="err">threads</span>
<span class="err">-s,-scan-authorizations</span> <span
class="err"><comma-separated-authorizations></span> <span
class="err">scan</span> <span class="err">authorizations</span>
<span class="err">(all</span> <span class="err">user</span> <span
class="err">auths</span> <span class="err">are</span> <span
class="err">used</span> <span class="err">if</span> <span
class="err">this</span> <span class="err">argument</span> <span
class="err">is</span> <span class="err">not</span> <span
class="err">specified)</span>
<span class="err">-st,-show-timestamps</span> <span
class="err">enables</span> <span class="err">displaying</span> <span
class="err">timestamps</span>
- <span class="err">-t,-num-threads</span> <span
class="err"><arg></span> <span class="err">num</span> <span
class="err">threads</span>
+ <span class="err">-t,-tableName</span> <span
class="err"><table></span> <span class="err">table</span> <span
class="err">to</span> <span class="err">grep</span> <span
class="err">through</span>
</pre></div>
@@ -545,7 +551,7 @@
</p>
<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">listscans</span> <span class="err">[-?]</span> <span
class="err">[-np]</span> <span class="err">[-ts</span> <span
class="err"><tablet</span> <span class="err">server>]</span>
<span class="err">description:</span> <span class="err">list</span> <span
class="err">what</span> <span class="err">scans</span> <span
class="err">are</span> <span class="err">currently</span> <span
class="err">running</span> <span class="err">in</span> <span
class="err">accumulo.</span> <span class="err">See</span> <span
class="err">the</span>
- <span
class="err">org.apache.accumulo.core.client.admin.ActiveScan</span> <span
class="err">javadoc</span> <span class="err">for</span> <span
class="err">more</span> <span class="err">information</span>
+ <span class="err">accumulo.core.client.admin.ActiveScan</span> <span
class="err">javadoc</span> <span class="err">for</span> <span
class="err">more</span> <span class="err">information</span>
<span class="err">about</span> <span class="err">columns.</span>
<span class="err">-?,-help</span> <span class="err">display</span> <span
class="err">this</span> <span class="err">help</span>
<span class="err">-np,-no-pagination</span> <span
class="err">disables</span> <span class="err">pagination</span> <span
class="err">of</span> <span class="err">output</span>
@@ -727,8 +733,8 @@
<p><strong>setiter</strong> <br />
</p>
-<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">setiter</span> <span class="err">[-?]</span> <span
class="err">-ageoff</span> <span class="err">|</span> <span
class="err">-agg</span> <span class="err">|</span> <span
class="err">-</span><span class="kd">class</span> <span
class="p"><</span><span class="err">name</span><span class="p">></span>
<span class="err">|</span> <span class="err">-nolabel</span> <span
class="err">|</span> <span class="err">-regex</span> <span class="err">|</span>
<span class="err">-vers</span>
- <span class="err">[-majc]</span> <span class="err">[-minc]</span> <span
class="err">[-n</span> <span class="err"><itername>]</span> <span
class="err">-p</span> <span class="err"><pri></span> <span
class="err">[-scan]</span> <span class="err">[-t</span> <span
class="err"><table>]</span>
+<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">setiter</span> <span class="err">[-?]</span> <span
class="err">-ageoff</span> <span class="err">|</span> <span
class="err">-agg</span> <span class="err">|</span> <span
class="err">-</span><span class="kd">class</span> <span
class="p"><</span><span class="err">name</span><span class="p">></span>
<span class="err">|</span> <span class="err">-regex</span> <span
class="err">|</span> <span class="err">-reqvis</span> <span
class="err">|</span> <span class="err">-vers</span>
+ <span class="err">[-majc]</span> <span class="err">[-minc]</span> <span
class="err">[-n</span> <span class="err"><itername>]</span> <span
class="err">-p</span> <span class="err"><pri></span> <span
class="err">[-scan]</span> <span class="err">[-t</span> <span
class="err"><table>]</span>
<span class="err">description:</span> <span class="err">sets</span> <span
class="err">a</span> <span class="err">table-specific</span> <span
class="err">iterator</span>
<span class="err">-?,-help</span> <span class="err">display</span> <span
class="err">this</span> <span class="err">help</span>
<span class="err">-ageoff,-ageoff</span> <span class="err">an</span> <span
class="err">aging</span> <span class="err">off</span> <span
class="err">type</span>
@@ -737,9 +743,9 @@
<span class="err">-majc,-major-compaction</span> <span
class="err">applied</span> <span class="err">at</span> <span
class="err">major</span> <span class="err">compaction</span>
<span class="err">-minc,-minor-compaction</span> <span
class="err">applied</span> <span class="err">at</span> <span
class="err">minor</span> <span class="err">compaction</span>
<span class="err">-n,-name</span> <span class="err"><itername></span>
<span class="err">iterator</span> <span class="err">to</span> <span
class="err">set</span>
- <span class="err">-nolabel,-no-label</span> <span class="err">a</span>
<span class="err">no-labeling</span> <span class="err">type</span>
<span class="err">-p,-priority</span> <span class="err"><pri></span>
<span class="err">the</span> <span class="err">order</span> <span
class="err">in</span> <span class="err">which</span> <span
class="err">the</span> <span class="err">iterator</span> <span
class="err">is</span> <span class="err">applied</span>
<span class="err">-regex,-regular-expression</span> <span
class="err">a</span> <span class="err">regex</span> <span
class="err">matching</span> <span class="err">type</span>
+ <span class="err">-reqvis,-require-visibility</span> <span
class="err">a</span> <span class="err">type</span> <span
class="err">that</span> <span class="err">omits</span> <span
class="err">entries</span> <span class="err">with</span> <span
class="err">empty</span> <span class="err">visibilities</span>
<span class="err">-scan,-scan-time</span> <span class="err">applied</span>
<span class="err">at</span> <span class="err">scan</span> <span
class="err">time</span>
<span class="err">-t,-table</span> <span class="err"><table></span>
<span class="err">tableName</span>
<span class="err">-vers,-version</span> <span class="err">a</span> <span
class="err">versioning</span> <span class="err">type</span>
@@ -748,17 +754,17 @@
<p><strong>setscaniter</strong> <br />
</p>
-<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">setscaniter</span> <span class="err">[-?]</span> <span
class="err">-ageoff</span> <span class="err">|</span> <span
class="err">-agg</span> <span class="err">|</span> <span
class="err">-</span><span class="kd">class</span> <span
class="p"><</span><span class="err">name</span><span class="p">></span>
<span class="err">|</span> <span class="err">-nolabel</span> <span
class="err">|</span> <span class="err">-regex</span> <span class="err">|</span>
- <span class="err">-vers</span> <span class="err">[-n</span> <span
class="err"><itername>]</span> <span class="err">-p</span> <span
class="err"><pri></span> <span class="err">[-t</span> <span
class="err"><table>]</span>
+<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">setscaniter</span> <span class="err">[-?]</span> <span
class="err">-ageoff</span> <span class="err">|</span> <span
class="err">-agg</span> <span class="err">|</span> <span
class="err">-</span><span class="kd">class</span> <span
class="p"><</span><span class="err">name</span><span class="p">></span>
<span class="err">|</span> <span class="err">-regex</span> <span
class="err">|</span> <span class="err">-reqvis</span> <span
class="err">|</span> <span class="err">-vers</span>
+ <span class="err">[-n</span> <span
class="err"><itername>]</span> <span class="err">-p</span> <span
class="err"><pri></span> <span class="err">[-t</span> <span
class="err"><table>]</span>
<span class="err">description:</span> <span class="err">sets</span> <span
class="err">a</span> <span class="err">table-specific</span> <span
class="err">scan</span> <span class="err">iterator</span> <span
class="err">for</span> <span class="err">this</span> <span
class="err">shell</span> <span class="err">session</span>
<span class="err">-?,-help</span> <span class="err">display</span> <span
class="err">this</span> <span class="err">help</span>
<span class="err">-ageoff,-ageoff</span> <span class="err">an</span> <span
class="err">aging</span> <span class="err">off</span> <span
class="err">type</span>
<span class="err">-agg,-aggregator</span> <span class="err">an</span> <span
class="err">aggregating</span> <span class="err">type</span>
<span class="err">-class,-class-name</span> <span
class="err"><name></span> <span class="err">a</span> <span
class="err">java</span> <span class="err">class</span> <span
class="err">type</span>
<span class="err">-n,-name</span> <span class="err"><itername></span>
<span class="err">iterator</span> <span class="err">to</span> <span
class="err">set</span>
- <span class="err">-nolabel,-no-label</span> <span class="err">a</span>
<span class="err">no-labeling</span> <span class="err">type</span>
<span class="err">-p,-priority</span> <span class="err"><pri></span>
<span class="err">the</span> <span class="err">order</span> <span
class="err">in</span> <span class="err">which</span> <span
class="err">the</span> <span class="err">iterator</span> <span
class="err">is</span> <span class="err">applied</span>
<span class="err">-regex,-regular-expression</span> <span
class="err">a</span> <span class="err">regex</span> <span
class="err">matching</span> <span class="err">type</span>
+ <span class="err">-reqvis,-require-visibility</span> <span
class="err">a</span> <span class="err">type</span> <span
class="err">that</span> <span class="err">omits</span> <span
class="err">entries</span> <span class="err">with</span> <span
class="err">empty</span> <span class="err">visibilities</span>
<span class="err">-t,-table</span> <span class="err"><table></span>
<span class="err">tableName</span>
<span class="err">-vers,-version</span> <span class="err">a</span> <span
class="err">versioning</span> <span class="err">type</span>
</pre></div>
Modified:
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Table_Configuration.html
==============================================================================
---
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Table_Configuration.html
(original)
+++
websites/staging/accumulo/trunk/content/accumulo/user_manual_1.4-incubating/Table_Configuration.html
Tue Dec 13 18:30:59 2011
@@ -186,9 +186,9 @@ accumulo/docs/examples/README.bloom . </
<h2 id="a_iditeratorsa_iterators"><a id=Iterators></a> Iterators</h2>
<p>Iterators provide a modular mechanism for adding functionality to be
executed by TabletServers when scanning or compacting data. This allows users
to efficiently summarize, filter, and aggregate data. In fact, the built-in
features of cell-level security and column fetching are implemented using
Iterators. Some useful Iterators are provided with Accumulo and can be found in
the org.apache.accumulo.core.iterators.user package. </p>
<h3
id="a_idsetting_iterators_via_the_shella_setting_iterators_via_the_shell"><a
id=Setting_Iterators_via_the_Shell></a> Setting Iterators via the Shell</h3>
-<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">setiter</span> <span class="err">[-?]</span> <span
class="err">-agg</span> <span class="err">|</span> <span
class="err">-</span><span class="kd">class</span> <span
class="p"><</span><span class="err">name</span><span class="p">></span>
<span class="err">|</span> <span class="err">-filter</span> <span
class="err">|</span> <span class="err">-nolabel</span> <span
class="err">|</span>
-<span class="err">-regex</span> <span class="err">|</span> <span
class="err">-vers</span> <span class="err">[-majc]</span> <span
class="err">[-minc]</span> <span class="err">[-n</span> <span
class="err"><itername>]</span> <span class="err">-p</span> <span
class="err"><pri></span> <span class="err">[-scan]</span>
-<span class="err">[-t</span> <span class="err"><table>]</span>
+<div class="codehilite"><pre><span class="err">usage:</span> <span
class="err">setiter</span> <span class="err">[-?]</span> <span
class="err">-ageoff</span> <span class="err">|</span> <span
class="err">-agg</span> <span class="err">|</span> <span
class="err">-</span><span class="kd">class</span> <span
class="p"><</span><span class="err">name</span><span class="p">></span>
<span class="err">|</span> <span class="err">-regex</span> <span
class="err">|</span>
+<span class="err">-reqvis</span> <span class="err">|</span> <span
class="err">-vers</span> <span class="err">[-majc]</span> <span
class="err">[-minc]</span> <span class="err">[-n</span> <span
class="err"><itername>]</span> <span class="err">-p</span> <span
class="err"><pri></span>
+<span class="err">[-scan]</span> <span class="err">[-t</span> <span
class="err"><table>]</span>
<span class="err">user@myinstance</span> <span class="err">mytable></span>
<span class="err">setiter</span> <span class="err">-t</span> <span
class="err">mytable</span> <span class="err">-scan</span> <span
class="err">-p</span> <span class="err">10</span> <span class="err">-n</span>
<span class="err">myiter</span>
</pre></div>
@@ -277,9 +277,9 @@ org.apache.accumulo.core.iterators.Filte
</pre></div>
-<h3 id="a_idaggregating_iteratorsa_aggregating_iterators"><a
id=Aggregating_Iterators></a> Aggregating Iterators</h3>
-<p>Accumulo allows aggregating iterators to be configured on tables and column
families. When an aggregating iterator is set, the iterator is applied across
the values associated with any keys that share rowID, column family, and column
qualifier. This is similar to the reduce step in MapReduce, which applied some
function to all the values associated with a particular key. </p>
-<p>For example, if an aggregating iterator were configured on a table and the
following mutations were inserted: </p>
+<h3 id="a_idcombinersa_combiners"><a id=Combiners></a> Combiners</h3>
+<p>Accumulo allows Combiners to be configured on tables and column families.
When a Combiner is set it is applied across the values associated with any keys
that share rowID, column family, and column qualifier. This is similar to the
reduce step in MapReduce, which applied some function to all the values
associated with a particular key. </p>
+<p>For example, if a summing combiner were configured on a table and the
following mutations were inserted: </p>
<div class="codehilite"><pre><span class="n">Row</span> <span
class="n">Family</span> <span class="n">Qualifier</span> <span
class="n">Timestamp</span> <span class="n">Value</span>
<span class="n">rowID1</span> <span class="n">colfA</span> <span
class="n">colqA</span> <span class="mi">20100101</span> <span
class="mi">1</span>
<span class="n">rowID1</span> <span class="n">colfA</span> <span
class="n">colqA</span> <span class="mi">20100102</span> <span
class="mi">1</span>
@@ -291,34 +291,34 @@ org.apache.accumulo.core.iterators.Filte
</pre></div>
-<p>Aggregating iterators can be enabled for a table as follows: </p>
-<div class="codehilite"><pre><span class="n">user</span><span
class="nv">@myinstance</span><span class="o">></span> <span
class="n">createtable</span> <span class="n">perDayCounts</span> <span
class="o">-</span><span class="n">a</span>
-<span class="n">day</span><span class="o">=</span><span
class="n">org</span><span class="o">.</span><span class="n">apache</span><span
class="o">.</span><span class="n">accumulo</span><span class="o">.</span><span
class="n">core</span><span class="o">.</span><span
class="n">iterators</span><span class="o">.</span><span
class="n">aggregation</span><span class="o">.</span><span
class="n">StringSummation</span>
-
-<span class="n">user</span><span class="nv">@myinstance</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">row1</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
-<span class="n">user</span><span class="nv">@myinstance</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">row1</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
-<span class="n">user</span><span class="nv">@myinstance</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">row1</span> <span class="n">day</span>
<span class="mi">20080103</span> <span class="mi">1</span>
-<span class="n">user</span><span class="nv">@myinstance</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">row2</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
-<span class="n">user</span><span class="nv">@myinstance</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">row3</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
-
-<span class="n">user</span><span class="nv">@myinstance</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">scan</span>
-<span class="n">row1</span> <span class="n">day:20080101</span> <span
class="o">[]</span> <span class="mi">2</span>
-<span class="n">row1</span> <span class="n">day:20080103</span> <span
class="o">[]</span> <span class="mi">1</span>
-<span class="n">row2</span> <span class="n">day:20080101</span> <span
class="o">[]</span> <span class="mi">2</span>
+<p>Combiners can be enabled for a table using the setiter command in the
shell. Below is an example. </p>
+<div class="codehilite"><pre><span class="n">root</span><span
class="nv">@a14</span> <span class="n">perDayCounts</span><span
class="o">></span> <span class="n">setiter</span> <span
class="o">-</span><span class="n">t</span> <span class="n">perDayCounts</span>
<span class="o">-</span><span class="n">p</span> <span class="mi">10</span>
<span class="o">-</span><span class="n">scan</span> <span
class="o">-</span><span class="n">minc</span> <span class="o">-</span><span
class="n">majc</span> <span class="o">-</span><span class="n">n</span> <span
class="n">daycount</span>
+ <span class="o">-</span><span class="n">class</span>
<span class="n">org</span><span class="o">.</span><span
class="n">apache</span><span class="o">.</span><span
class="n">accumulo</span><span class="o">.</span><span
class="n">core</span><span class="o">.</span><span
class="n">iterators</span><span class="o">.</span><span
class="n">user</span><span class="o">.</span><span
class="n">SummingCombiner</span>
+<span class="n">TypedValueCombiner</span> <span class="n">can</span> <span
class="n">interpret</span> <span class="n">Values</span> <span
class="n">as</span> <span class="n">a</span> <span class="n">variety</span>
<span class="n">of</span> <span class="n">number</span> <span
class="n">encodings</span>
+ <span class="p">(</span><span class="n">VLong</span><span class="p">,</span>
<span class="n">Long</span><span class="p">,</span> <span class="ow">or</span>
<span class="n">String</span><span class="p">)</span> <span
class="n">before</span> <span class="n">combining</span>
+<span class="o">----------></span> <span class="n">set</span> <span
class="n">SummingCombiner</span> <span class="n">parameter</span> <span
class="n">columns</span><span class="p">,</span>
+ <span class="o"><</span><span class="n">col</span> <span
class="n">fam</span><span class="o">></span><span class="p">[:</span><span
class="o"><</span><span class="n">col</span> <span
class="n">qual</span><span class="o">></span><span class="p">]{,</span><span
class="o"><</span><span class="n">col</span> <span class="n">fam</span><span
class="o">></span><span class="p">[:</span><span class="o"><</span><span
class="n">col</span> <span class="n">qual</span><span
class="o">></span><span class="p">]}</span> <span class="p">:</span> <span
class="n">day</span>
+<span class="o">----------></span> <span class="n">set</span> <span
class="n">SummingCombiner</span> <span class="n">parameter</span> <span
class="n">type</span><span class="p">,</span> <span
class="sr"><VARNUM|LONG|STRING></span><span class="p">:</span> <span
class="n">STRING</span>
+
+<span class="n">root</span><span class="nv">@a14</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">foo</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
+<span class="n">root</span><span class="nv">@a14</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">foo</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
+<span class="n">root</span><span class="nv">@a14</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">foo</span> <span class="n">day</span>
<span class="mi">20080103</span> <span class="mi">1</span>
+<span class="n">root</span><span class="nv">@a14</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">bar</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
+<span class="n">root</span><span class="nv">@a14</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">insert</span> <span class="n">bar</span> <span class="n">day</span>
<span class="mi">20080101</span> <span class="mi">1</span>
+
+<span class="n">root</span><span class="nv">@a14</span> <span
class="n">perDayCounts</span><span class="o">></span> <span
class="n">scan</span>
+<span class="n">bar</span> <span class="n">day:20080101</span> <span
class="o">[]</span> <span class="mi">2</span>
+<span class="n">foo</span> <span class="n">day:20080101</span> <span
class="o">[]</span> <span class="mi">2</span>
+<span class="n">foo</span> <span class="n">day:20080103</span> <span
class="o">[]</span> <span class="mi">1</span>
</pre></div>
-<p>Accumulo includes the following aggregators: </p>
-<ul>
-<li><strong>LongSummation</strong>: expects values of type long and adds them.
</li>
-<li><strong>StringSummation</strong>: expects numbers represented as strings
and adds them. </li>
-<li><strong>StringMax</strong>: expects numbers as strings and retains the
maximum number inserted. </li>
-<li><strong>StringMin</strong>: expects numbers as strings and retains the
minimum number inserted. </li>
-</ul>
-<p>Additional Aggregators can be added by creating a Java class that
implements <br />
-<strong>org.apache.accumulo.core.iterators.aggregation.Aggregator</strong> and
adding a jar containing that class to Accumulo's lib directory. </p>
-<p>An example of an aggregator can be found under <br />
-accumulo/src/examples/main/java/org/apache/accumulo/examples/aggregation/SortedSetAggregator.java
</p>
+<p>Accumulo includes some useful Combiners out of the box. To find these look
in the <br />
+<strong>org.apache.accumulo.core.iterators.user</strong> package. </p>
+<p>Additional Combiners can be added by creating a Java class that extends <br
/>
+<strong>org.apache.accumulo.core.iterators.Combiner</strong> and adding a jar
containing that class to Accumulo's lib/ext directory. </p>
+<p>An example of a Combiner can be found under <br />
+accumulo/src/examples/main/java/org/apache/accumulo/examples/combiner/StatsCombiner.java
</p>
<h2 id="a_idblock_cachea_block_cache"><a id=Block_Cache></a> Block Cache</h2>
<p>In order to increase throughput of commonly accessed entries, Accumulo
employs a block cache. This block cache buffers data in memory so that it
doesn't have to be read off of disk. The RFile format that Accumulo prefers is
a mix of index blocks and data blocks, where the index blocks are used to find
the appropriate data blocks. Typical queries to Accumulo result in a binary
search over several index blocks followed by a linear scan of one or more data
blocks. </p>
<p>The block cache can be configured on a per-table basis, and all tablets
hosted on a tablet server share a single resource pool. To configure the size
of the tablet server's block cache, set the following properties: </p>
@@ -359,7 +359,7 @@ accumulo/src/examples/main/java/org/apac
</pre></div>
-<p>When a tablet reaches this number of files and needs to flush its in-memory
data to disk, it will choose to do a merging minor compaction. A merging minor
compaction will merge the tablet's smallest file with the data in memory at
minor compaction time. Therefore the number of files will not grow beyond this
limit. This will make minor compactions take longer, which will cause ingest
performance to decrease. This can cause ingest to slow down until major
compactions have enough time to catch up. When adjusting this property, also
consider adjusting the compaction ratio. Ideally, merging minor compactions
never need to occur and major compactions will keep up. It is possible to
configure the file max and compaction ratio such that only merging minor
compactions occur and major compactions never occur. This should be avoided
because doing only merging minor compactions causes <img alt="$O(N^2)$"
src="img2.png" /> work to be done. The amount of work done by major compactions
is <img alt="$O(N*klzzwxh:0051og_R(N))$" src="img3.png" /> where
<em>R</em> is the compaction ratio. </p>
+<p>When a tablet reaches this number of files and needs to flush its in-memory
data to disk, it will choose to do a merging minor compaction. A merging minor
compaction will merge the tablet's smallest file with the data in memory at
minor compaction time. Therefore the number of files will not grow beyond this
limit. This will make minor compactions take longer, which will cause ingest
performance to decrease. This can cause ingest to slow down until major
compactions have enough time to catch up. When adjusting this property, also
consider adjusting the compaction ratio. Ideally, merging minor compactions
never need to occur and major compactions will keep up. It is possible to
configure the file max and compaction ratio such that only merging minor
compactions occur and major compactions never occur. This should be avoided
because doing only merging minor compactions causes <img alt="$O(N^2)$"
src="img2.png" /> work to be done. The amount of work done by major compactions
is <img alt="$O(N*klzzwxh:0053og_R(N))$" src="img3.png" /> where
<em>R</em> is the compaction ratio. </p>
<p>Compactions can be initiated manually for a table. To initiate a minor
compaction, use the flush command in the shell. To initiate a major compaction,
use the compact command in the shell. The compact command will compact all
tablets in a table to one file. Even tablets with one file are compacted. This
is useful for the case where a major compaction filter is configured for a
table. In 1.4 the ability to compact a range of a table was added. To use this
feature specify start and stop rows for the compact command. This will only
compact tablets that overlap the given row range. </p>
<h2 id="a_idpre-splitting_tablesa_pre-splitting_tables"><a
id=Pre-splitting_tables></a> Pre-splitting tables</h2>
<p>Accumulo will balance and distribute tables accross servers. Before a table
gets large, it will be maintained as a single tablet on a single server. This
limits the speed at which data can be added or queried to the speed of a single
node. To improve performance when the a table is new, or small, you can add
split points and generate new tablets. </p>
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